Richard Causey, the last of the top Enron Corp. executives to learn his punishment, was sentenced Wednesday to five and a half years in prison for his role in one of the biggest corporate scandals in U.S. history.

After nine weeks, prosecutors from the Enron Task Force paraded rested their case alleging Ken Lay and Jeff Skilling conspired to hide the true state of the company's finances from the investing public. Starting Monday in Houston, defense lawyers will present the other side. The heart of their case is expected to come when Skilling and Lay take the stand.

A former Andersen auditor, who managed the firm's lucrative Enron account while the energy giant cooked its books, is no longer a felon. But he could still prove to be a pivotal witness in the upcoming trial of former Enron CEOs Ken Lay and Jeff Skilling.

The Enron scandal has produced another trial, this time focusing on the company's broadband unit. Three former executives allegedly made false claims about the network that boosted the company's stock and let them sell inflated shares.

A second former Enron executive admitted Tuesday that the company's broadband division was a fraud. Kevin Hannon, 44, former chief operating officer of Enron Broadband, pleaded guilty in federal court in Houston to one count of conspiracy and agreed to cooperate with government prosecutors.

The man who once led Enron's (ENRNQ) high-speed Internet unit pleaded guilty Friday to securities fraud and agreed to help federal prosecutors on other cases related to the energy giant's collapse. Kenneth Rice faces a maximum of 10 years in prison and a fine of up to $1 million for the single fraud count.